Which person would likely have more bias toward a product?

The person who occasionally buys the product.

The person who invented the product.

The person who invented the product would obviously have the most bias.

Explanation:

Think of it like a mother and her child. Obviously the mother is going to love her child more than anyone else. Even people who see her child daily, like teachers or people that are not a part of immediate family. Why? Because she created it and watched it grow from infancy. Same thing applies to why an entrepreneur will be more biased towards their product.